A truck covers 50 km with a speed of 40 kmh and the next 50 km with a speed of 60 kmh
Calculate the average speed of the truck,
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Answer:
distance covered in 1st time =50km
speed of truck =40 km/hr.
time =distance /speed
time taken=50/40
=5/4hr.
distance covered in 2nd time =50km
speed=60km/hr
time taken=50/60
=5/6
average speed = total distance /total time
=(50+50) /(5/4+5/6)
=100/{(5*3+5*2) /12}
=100/{(15+10) /12}
=100/25/12
=100*12/25
=4*12
=48km/hr
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